Tension-controlling means for embroidering-machines.



R. ZAHN. TENSION CONTROLLING MEANS FOR EMBROIDERING MACHINES.

APPLICATION FILED JUNE 1, 1912.

1,094,044. Patented Apr. 21, 1914.

COLUMBIA PLANOORAPH co wAsmNuTmg. D. 0

ROBERT ZAHN, OF PLAUEN, GERMANY.

TENSION-CONTROLLING MEANS FOR E 1VIBROIDERING-MACHINES Specification of Letters Patent.

Patented Apr. 21, 1914.

Application filed. June 1, 1912. Serial No. 701,015.

To all whom it may concern:

Be it known that I, ROBERT ZAHN, a sub ject of the German Emperor, residing at Plauen, Kingdom of Saxony, Germany, have invented certain new and useful Improvements in Tension-Controlling Means for Embroidering-Machines, of which the fol lowing is a specification.

The present invention relates to jacquard embroidering machines and has for its object to provide a device for automatically controlling the tension of the needle thread in such a manner that at one time only the means for looking the needle thread and at another time the latter in conjunction with the means for breaking the needle thread are controlled from a common jacquard needle.

The invention is illustrated in the accompanying drawing forming a part of this specification and in which similar reference letters denote corresponding parts.

Figure 1 illustrates more or less diagrammatically the mechanism for controlling the needle thread tension mechanism in inoperative position; and Figs. 2 and 3 in a similar manner illustrate the mechanism in different positions.

With reference to the drawing, 1 denotes the main shaft of the embroidering machine which positively drives the shaft 4 by means of gears 2 and 3 the ratio of which is 1:2, so that during one revolution of the main shaft 1, the ascending portion of the cam groove 5 of the cam 5 fixed on the shaft 4 and during another revolution the descending portion thereof will come into action. By this cam 5 oscillation is imparted to a bell crank lever 6 engaging with one arm the cam groove 5 and the other arm of which is provided with a pin 6 which is adapted to engage notches 7 provided on one side of the lower end of a reciprocating rod 7. On the opposite side the rod 7 is provided with two other notches 7 2 which are capable of engaging stationary abutments 8 8 The rod 7 is slidably bornein a sleeve shaped head 23 of a rod 23 which is arranged at a right angle thereto and which, in well known manner, is controlled from the jacquard mechanism (not shown) so as to be brought either with its notches 7 into on gagement with the pin 6 of the lever 6 or with its notches 7 into engagement with the stationary abutments 8 8 The thread rollers 18, in well known manner, are provided at certain intervals with brake disks 8 and ratchet wheels 9 and cooperating with the brake disks are brake arms 10. The brake arms 10 are actuated by a spring 26, one end of which is secured to the link or rod 13 connecting the arms 10, and the other end of which is connected to a member 12 slidably mounted on said rod 13. This member has an arm 12 with which cooperates a cam 11 fixed on a spindle 11 By means of said cam the tension of the spring 26 can be regulated. The movement of the member 12 on the rod 13 is limited by stops 13 fixed on the rod 13. When the spindle 11 of the cam 11 is so turned that the tension of the spring 24 is decreased the brake action between the disks 8 and the brake arms 10 is weakened. On the other hand when the spindle 11 of the cam 11 is so turned that the tension of the spring 24 is increased the said brake action is made stronger.

Engaging the teeth of the ratchet wheels 9 are pawls 14. These pawls are operated by means of a link or rod 17 from the cam 15 fixed to the main shaft 1 of the machine. When the pawls 14 are lifted the thread rollers 18 are released for a short period so that a corresponding portion of the thread 25 leading to the eyes of the needles 25 can be drawn 011 the roller 18.

The rod 17 is actuated by a spring 24 one end of which is secured to said rod 17 and the other end of which is secured to the arm 12 of the member 12. This spring 24 tends to normally hold the rod 17 in lowered position. The tension of the spring 24 is regulated by the cam 11 in the same manner as itregulates the tension of the spring 26. The rods 13 and 17 each carry an arm 19 and 20 respectively, directed toward one another. Arranged below said arm are two tappets 21, 22 fixed on a common spindle which by a crank arm 7 is connected to the jacquard controlled rod 7. When the tappet 22 is raised it lifts the arm 20 and consequently the rod 17 and when the tappet 21 is raised it lifts the arm 19 and consequently the rod 13.

In the position shown in Fig. 1 the brakes 8, l0 and the locking mechanisms 9, 14 are both in action, as both tappets 21, 22 are out of engagement with the respective arms 19, 20. To release the locking mechanism the rod 23 under the influence of the jacquard mechanism brings the rod 7 into enga e ment with the pin 6 of the oscillating lever 6 and simultaneously disengages it from the stationary abutment 8 By the oscillation of the lever 6 the rod 7 is drawn downwardly and by the rising of the jacquard operated rod 23 it is brought into engagement with the abutment 8 This position is shown in Fig. 2. The lever 6 then oscillates idly until the rod 7 is again brought into engagement with the pin 6 of the lever 6. In the position shown in Fig. 2 the rod 7 has lifted the tappet 22 and consequently the arm 20 whereby the rod 17 and pawls 14 are lifted. The ratchet wheels 9 are no wfree and the needle thread 25 can be drawn off the rollers 18 to any desired extent while the brake 8, 10 being still in action tensions the thread to a certain extent.

When it is desired to release the brake the rod 7 through the medium of the jacquard operated rod 23 is drawn more down, so that the pivot 6 of the lever 6 engaging therewith brings it into the position shown in Fig. 3 in which it engages with the abutment 8 and whereby the tappet 21 is brought into engagement with the arm 19 lifting the latter against the tension of the spring 26, and consequently the link 13 and brake arms 10. Hereby the thread rollers 18 are entirely released and all tension removed from the thread. The release of the brake action and the temporary release of the pawls from the ratchet wheels have always been necessary.

It is particularly important that both, the locking mechanism and the brake mechanism, are controlled by a single or common jacquard needle, at one time simultaneously and at another time only the locking mechanism.

What I claim and desire to secure by Let ters Patent is:

1. In a jacquard embroidering machine, the combination with the needle thread tensioning mechanism, comprising thread braking means and thread locking means, of a mechanism for controlling both said thread braking and thread locking means and a single jacquard controlled means for said controlling mechanism, whereby either both the braking and the locking means or the locking means only may be released.

2. In a jacquard embroidering machine, the combination with the needle thread tensioning mechanism, comprising thread braking means and thread locking means, of a mechanism for successively controlling both said thread braking means and thread locking means and a single jacquard controlled means for said controlling mechanism, whereby either both the braking and the locking means or the locking means only may be released.

3. In a jacquard embroidering machine, the combination with the needle thread tensioning mechanism, comprising thread braking means and thread locking means, of a mechanism for controlling both said thread braking and thread locking means and comprising two rotary members having a common axis, and a single jacquard controlled means for operating said members, whereby either the braking and the locking means or the locking means only may be released.

4. In a jacquard embroidering machine, the combination with thread braking means and thread locking means, of an arm connected to each of said means, two rotary members having a common axis adapted to successively cooperate with said arms and a single jacquard controlled means for operating said members, whereby either the braking and the lockingmeans or the locking means only may be released.

5. In a jacquard embroidering machine, the combination with thread locking means including a spring actuated rod, and thread braking means including a spring actuated rod, of an arm secured to each of said rods, two rotary members having a common axis adapted to successively cooperate with said arms and a single jacquard controlled means for operating said members, whereby either the braking and the locking means or the locking means only may be released.

6. In a jacquard embroidering machine, the combination with thread locking means including a spring actuated rod and thread braking means including a spring actuated rod, of an arm secured to each of said rods, two rotary members having a common axis adapted to successively cooperate with said arms and a jacquard controlled reciprocating member operatively connected to both of said rotary members and whereby either the braking and the locking means or the locking means only may be released.

7. In a jacquard embroidering machine, the combination with thread locking means including a spring actuated rod and thread braking means including a spring actuated rod, of an arm secured to each of said rods, to rotary members having a common axis adapted to successively cooperate with said arms, a jacquard controlled reciprocating member operatively connected to both of said rotary members and whereby either the braking and the locking means or the locking means only may be released and means for reciprocating said reciprocating member.

In testimony whereof I aflix my signature in presence of two witnesses.

ROBERT ZAIIN.

Witnesses A. Cmrrrs Born, ROBERT H. NIER.

Gopies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, .D. G. 

